[libixion] this is no longer necessary

[David Tardon]

commit db79db39a1a6085b7e2d6cea6eb3fc740cb1cf04
Author: David Tardon <dtardon at redhat.com>
Date:   Fri Mar 6 17:24:47 2015 +0100

    this is no longer necessary

 libixion.spec | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/libixion.spec b/libixion.spec
index 7981415..5a53bd7 100644
--- a/libixion.spec
+++ b/libixion.spec
@@ -79,7 +79,7 @@ cp %{PATCH1} test/
 %build
 aclocal
 automake
-%configure --disable-silent-rules --disable-static CPPFLAGS=-DBOOST_DISABLE_ASSERTS
+%configure --disable-silent-rules --disable-static
 sed -i \
     -e 's|^hardcode_libdir_flag_spec=.*|hardcode_libdir_flag_spec=""|g' \
     -e 's|^runpath_var=LD_RUN_PATH|runpath_var=DIE_RPATH_DIE|g' \